package com.alibaba.jstorm.utils;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.log4j.Logger;


/**
 * 
 * @author yannian
 * 
 */
public class PathUtils {
    static Logger LOG = Logger.getLogger(PathUtils.class);

    public static final String SEPERATOR = "/";


    /**
     * split path as list
     * 
     * @param path
     * @return
     */
    public static List<String> tokenize_path(String path) {
        String[] toks = path.split(SEPERATOR);
        java.util.ArrayList<String> rtn = new ArrayList<String>();
        for (String str : toks) {
            if (!str.isEmpty()) {
                rtn.add(str);
            }
        }
        return rtn;
    }


    public static String toks_to_path(List<String> toks) {
        StringBuffer buff = new StringBuffer();
        buff.append(SEPERATOR);
        int size = toks.size();
        for (int i = 0; i < size; i++) {
            buff.append(toks.get(i));
            if (i < (size - 1)) {
                buff.append(SEPERATOR);
            }

        }
        return buff.toString();
    }


    public static String normalize_path(String path) {
        String rtn = toks_to_path(tokenize_path(path));
        return rtn;
    }


    public static String parent_path(String path) {
        List<String> toks = tokenize_path(path);
        int size = toks.size();
        if (size > 0) {
            toks.remove(size - 1);
        }
        return toks_to_path(toks);
    }


    public static String full_path(String parent, String name) {
        return normalize_path(parent + SEPERATOR + name);
    }


    public static boolean exists_file(String path) {
        return (new File(path)).exists();
    }


    public static void rmr(String path) throws IOException {
        LOG.debug("Rmr path " + path);
        if (exists_file(path)) {
            FileUtils.forceDelete(new File(path));
        }

    }


    public static void local_mkdirs(String path) throws IOException {
        LOG.debug("Making dirs at" + path);
        FileUtils.forceMkdir(new File(path));
    }


    public static void rmpath(String path) {
        LOG.debug("Removing path " + path);
        boolean isdelete = (new File(path)).delete();
        if (!isdelete) {
            throw new RuntimeException("Failed to delete " + path);
        }
    }


    public static void touch(String path) throws IOException {
        LOG.debug("Touching file at" + path);
        boolean success = (new File(path)).createNewFile();
        if (!success) {
            throw new RuntimeException("Failed to touch " + path);
        }
    }


    public static List<String> read_dir_contents(String dir) {
        ArrayList<String> rtn = new ArrayList<String>();
        if (exists_file(dir)) {
            File[] list = (new File(dir)).listFiles();
            for (File f : list) {
                rtn.add(f.getName());
            }
        }
        return rtn;
    }

}
